[1] It was created from the fusion of two ancient Roman roads, the Via Latina and the Via Labicana.
The Via Labicana led from Rome to Labicum, while the Via Latina ended at Capua.
In the Middle Ages, Capua was depopulated and the main settlement shifted to Casilinum, formerly a mere fluvial port.
The current route of the state road Via Casilina leaves the Porta Maggiore in Rome and, entering the Roman countryside, first runs through the valley of the river Sacco, crossing Frosinone, and then the Liri valley, passing through the center of Cassino; enters Campania remaining in the northern part of the province of Caserta and joins with the via Appia in the municipality of Pastorano in province of Caserta.
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